Rename Handler as DiagCtxt.

Author: nnethercote

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -220,7 +220,7 @@ impl<'a> AstValidator<'a> {
         }
     }
 
-    fn err_handler(&self) -> &rustc_errors::Handler {
+    fn err_handler(&self) -> &rustc_errors::DiagCtxt {
         self.session.diagnostic()
     }
 
@@ -697,7 +697,7 @@ impl<'a> AstValidator<'a> {
 /// Checks that generic parameters are in the correct order,
 /// which is lifetimes, then types and then consts. (`<'a, T, const N: usize>`)
 fn validate_generic_param_order(
-    handler: &rustc_errors::Handler,
+    handler: &rustc_errors::DiagCtxt,
     generics: &[GenericParam],
     span: Span,
 ) {

compiler/rustc_ast_passes/src/show_span.rs

@@ -31,7 +31,7 @@ impl FromStr for Mode {
 }
 
 struct ShowSpanVisitor<'a> {
-    span_diagnostic: &'a rustc_errors::Handler,
+    span_diagnostic: &'a rustc_errors::DiagCtxt,
     mode: Mode,
 }
 
@@ -58,7 +58,7 @@ impl<'a> Visitor<'a> for ShowSpanVisitor<'a> {
     }
 }
 
-pub fn run(span_diagnostic: &rustc_errors::Handler, mode: &str, krate: &ast::Crate) {
+pub fn run(span_diagnostic: &rustc_errors::DiagCtxt, mode: &str, krate: &ast::Crate) {
     let Ok(mode) = mode.parse() else {
         return;
     };